The purpose of an on a map is to figure out how the distances on the map relate to the actual distances on the ground. legend, scale, compass, index

The answer is a legend :) Hope I helped!

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).